Promotion of s4watr:hasPhenomenonTime
OP s4watr:hasPenomenonTime is introduced on saref:Measurement as a more precise property than saref:hasTimestamp. This property is named and defined after sosa:hasPhenomenonTime from the W3C SOSA/SSN ontology, and could be promoted to SAREF Core.
SAREF4LIFT defines many subclasses of saref:Measurement, such as s4lift:NumberOfCallsStatistics. These measurements can be timestamped with saref:hasTimeStamp, but the phenomenon time is not available in SAREF. The property s4watr:phenomenonTime could be useful in SAREF4LIFT.